EXPERIMENT 1 INTRODUCTION TO LABORATORY INSTRUMENTS

Transcription

1 EXPERIMENT 1 INTRODUCTION TO LABORATORY INSTRUMENTS 1.1 Objective: In this experiment, multimeters and some circuit components are introduced. You will learn the following things: i. Reading the color codes of resistors. ii. Using a multimeter for resistance measurements. iii. Measuring DC currents and voltages with a digital multimeter in a resistive circuit iv. Characteristics of resistors in parallel and series 1.2 Equipment List: Multimeter, CADET, Carbon Resistors (four 33kΩ, two 10kΩ, six 1kΩ)

2 1.3 Preliminary Work: 1. Solve the circuits given below (Figure 1, 2, 3, 4 and 5); find the all currents and voltage values where R1=1 kω, R2=R3=10 kω, R4=3.3 kω. I1 R1 I2 R1 V1 V2 5V 5V V3 R2 Figure 1 Figure 2 I5 R1 I3 I4 V6 I6 I7 5V V4 R1 V5 R2 5V V7 R2 V8 R3 Figure 3 Figure 4 Figure 5

3 2. Calculate the equivalent resistance (Rab) and current (I11) of the circuit in Figure 6 Figure 6 3. Write the color codes of resistors at Table 1 according to the Table 2 Table 1 Resistors Color Codes (10% Tolerance) 22 kω 3.3 kω 12 kω 18 kω 1 MΩ Table 2

4 ATTENTION: i. Make sure that you have the necessary instruments and components. The layout of breadboards on your cadets is shown below. All circuits will be set up on these breadboards during lab sessions. The breadboards have a set of holes spaced 0.1 inches apart and arranged in a pattern similar to that shown below. There are two horizontal lines with several groups of five holes in each line at the top and bottom edge of the board. Holes on breadboard, shown in Figure 7(a), are electrically interconnected as shown in Figure 7(b). There are two sets of vertical lines with five holes in each line at the center section of the breadboard. There is 0.3 inch space between the top and bottom set to match the standard spacing of pins on integrated circuit (IC) chips. The holes will accept the solid wire leads of most electronic components. (a) (b) Figure 7. (a) Top view, (b) inner connections of breadboard

5 A configuration example of three resistors in series on breadboard is shown in Figure 8. Figure 8. Configuration example of resistors on breadboard ii. To measure the voltage across a resistor, the voltmeter must be connected to the resistor in parallel as shown in Figure 9. V V in R Figure 9 To measure the current through a resistor, the ampermeter must be connected to the resistor in series as shown in Figure 10. A V in R Figure 10

6 1.4 Experimental Work: 1. i. Read the color codes, determine the nominal value and tolerance of each carbon resistor and record them. ii. Measure the values of the resistors with the digital multimeter and record them. iii. Compare the measured and nominal values of the resistors. 2. Set the multimeter to DC voltage measurement and measure the DC voltage supply outputs on CADET. 3. Set up the circuits given at preliminary work part 1. Measure and record all the currents and the voltages using the digital multimeter. Compare your experimental results with your calculations. 4. Set up the circuit given at Figure 6. Measure and record equivalent resistance (Rab) and current (I11) using the digital multimeter. Compare your experimental results with your calculations.

7 EXPERIMENT 1 REPORT SHEET ( ) Name & Surname (1) : (2) : Date : Experimental Work: 1. Color Code Nominal Value Tolerance (%) Measured Value Comment: 2. Voltage Supply Outputs Adjustable (13) volts 5 volts Symmetric supply (12) volts Symmetric supply (12) volts

8 3. Voltages Measured Calculated Currents Measured Calculated V1 V2 V3 V4 V5 V6 V7 V8 V9 V10 I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 V11 V12 Comment: 4. Rab I11 Measured Calculated 5. Conclusion:

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